Coseismic Vertical Displacement and Fault Motion Model of the Nepal Mw7.9 Earthquake

LI Shuiping; WANG Qi; CHEN Gang; QIAO Xuejun; YANG Shaomin; HE Ping; CHEN Chao

doi:10.13203/j.whugis20160057

Volume 42 Issue 10

Oct. 2017

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Geomatics and Information Science of Wuhan University > 2017 > 42(10): 1489-1496. > DOI: 10.13203/j.whugis20160057

LI Shuiping, WANG Qi, CHEN Gang, QIAO Xuejun, YANG Shaomin, HE Ping, CHEN Chao. Coseismic Vertical Displacement and Fault Motion Model of the Nepal Mw7.9 Earthquake[J]. Geomatics and Information Science of Wuhan University, 2017, 42(10): 1489-1496. DOI: 10.13203/j.whugis20160057

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Coseismic Vertical Displacement and Fault Motion Model of the Nepal Mw7.9 Earthquake

LI Shuiping^{1, 2,},
WANG Qi¹,
CHEN Gang^2, ,,
QIAO Xuejun³,
YANG Shaomin³,
HE Ping^{1, 4},
CHEN Chao¹

1.
Hubei Subsurface Multi-scale Imaging Key Laboratory, Institute of Geophysics and Geomatics, China University of Geosciences, Wuhan 430074, China
2.
Faculty of Informaiton Engineering, China University of Geosciences, Wuhan 430074, China
3.
Institute of Seismology, China Earthquake Administration, Wuhan 430071, China
4.
Key Laboratory of Geospace Environment and Geodesy, Ministry of Education, Wuhan University, Wuhan 430079, China

Funds:

The National Natural Science foundation of China 41274036

The National Natural Science foundation of China 41274037

the China Postdoctoral Science Foundation 2015M57228

the Basic Fund of Hubei Subsurface Multi-scale Imaging Key Laboratory SMIL-2015-01

the Fundamental Research Funds for the Central Universities CUGL150810

the Basic Research Fund of Key Laboratory of Geospace Environment and Geodesy, Ministry of Education of China 13-02-11

the Basic Research Fund of Key Laboratory of Geospace Environment and Geodesy, Ministry of Education of China 14-01-01

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Author Bio:
LI Shuiping, PhD candidate, specializes in space geodesy research. E-mail: cug_lsp@foxmail.com
Corresponding author:
CHEN Gang, phD, professor, E-mail:ddwhcg@cug.edu.cn
Received Date: May 19, 2016
Published Date: October 04, 2017

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Abstract

Abstract

The 2015 Nepal Mw7.9 earthquake occurred in the central segment of the Himalayan collision zone, where the rigid Indian plate thrusts beneath the Tibetan Plateau. The published focal mechanism solution shows this earthquake was dominated by thrust slip but minor right-lateral strike slip, so a significant vertical deformation appears on the surface caused by this event. Accurate coseismic vertical displacements in this region provide us a scarce chance to understand the long term uplift of the Himalaya and southern Tibet. By processing the resurvey 'in-situ' GPS data, we obtained a coseismic GPS horizontal displacement field at high precision. In combination with the coseismic GPS displacements and the L-band InSAR line of sight (LOS) observations, we extract the coseismic vertical deformation field due to the Nepal earthquake with a mean uncertainty of 1~2 cm and spatial resolution of 1 km×1 km. The result shows that the Kathmandu was uplifted ~0.95 m after the main shock. In particular, the Mount Everest and Shishapangma subsided~2-3 cm and ~20 cm, respectively. The two-dimensional elastic half-space dislocation model suggests that the mean rupture width of the Nepal earthquake was~60 km and the average coseismic slip reached 4 m. Our results indicate that the slip deficit of this event was equivalent to a moment magnitude of Mw 7.89 assuming a rupture length of 120 km and rigidity of 30 GPa, which is consistent with seismological estimation.The 2015 Nepal earthquake broke the trend of long term uplift in the central segment of higher Himalaya during an interseismic period. Whether this segment will continue to subside or uplift after the event can be discriminated by continuous post-seismic geodetic measurements.
- Nepal earthquake,
- GPS,
- InSAR,
- vertical displacement,
- model inversion

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References

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Coseismic Vertical Displacement and Fault Motion Model of the Nepal Mw7.9 Earthquake

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